C - Chemistry – Metallurgy – 21 – B
Patent
C - Chemistry, Metallurgy
21
B
53/342
C21B 3/06 (2006.01) C21B 7/04 (2006.01) C22B 7/04 (2006.01)
Patent
CA 1087861
ABSTRACT OF THE DISCLOSURE A method for the continuous or intermittent treat- ment of molten slag, especially slag containing heavy-metal oxides, in order to recover valuable metals and compounds there- of contained in the slag by causing the valuable metals and compounds to settle under the molten slag or to volatilize out of the slag. Unlike a top-blowing process utilized in steel making, no attempt is made according to the present invention to obtain a three-phase slag-gas-metal mix. Rather, what is created is a specific, torus-like laminar flow with a definite transfer of metal and heat. This type of flow is unknown in the prior art, even in corresponding processes for producing and refining non-ferrous metals. The method according to the present invention comprises the steps of: blowing a jet of reaction gases through a nozzle approximately perpendicularly onto the slag with sufficient force to produce in the molten slag a laminar flow substantially in the form of a torus which rotates about a depression caused by a blast at a stagnation point of the jet. The laminar flow in conjunction with the jet of gas produces a reaction unit defined by an area of a convective system and having a definite transfer of material, a diameter of which, in the area of the molten slag at right angles to a direction of the jet, is approximately two to five blast-depression diameters, whereas a depth thereof is approx- imately half that dimension.
287749
Swabey Ogilvy Renault
Wuth Wolfgang
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